This brand new Lenovo ThinkPad L520 42T4795 42T4794 replacement laptop battery features lithium-ion cells. Li-ion battery technology provides longer run times with less weight. In addition, Li-ion batteries are not subject to the memory effect common with older battery technology. This laptop battery replacement is 100% compatible with the original battery specifications and is individually tested and backed by a 2 Year warranty.

You can expect about 5 - 6 hours of run time with this ThinkPad L520 battery when new, depending on your energy use. If you would like even longer hours of run time please check out our extended run battery LEN-15XT.